# physics

In a projectile motion, if we measure the maximum
height h and horizontal range R
(1) How to get launch angle θ in terms of h and R
(2) A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point.What is the angle of launch?
What is the launch speed?

1. 👍 0
2. 👎 0
3. 👁 81
asked by Jenny
1. Let θ be the launch angle. Assume the ground is level. Let V be the launch speed.

R = 2 (V^2/g) sin θ cos θ

h = V^2 sin^2 θ / (2g)

R = 4 h cosθ/sin θ = 4 h cotθ

Check my thinkng.

1. 👍 0
2. 👎 0
posted by drwls
2. 21

1. 👍 0
2. 👎 0
posted by Anonymous

## Similar Questions

1. ### physics question

In a projectile motion, the horizontal range and the maximum height attained by the projectile are equal . A) what is the launch angle? B) If everything else slays the same , how should the launch angle, ¦È0, of a projectile be

asked by himel on August 17, 2016
2. ### Physics

Q Exactly 2.7s after a projectile is fired into the air from the ground ,it is observed to have a velocity v = (8.8i+4.5 j) m/s where the x-axis is horizontal and the y axis is positive upward . a)Determine the horizontal range of

asked by Nikitha on September 1, 2012
3. ### physics

The range R of a projectile is defined as the magnitude of the horizontal displacement of the projectile when it returns to its original altitude. (In other words, the range is the distance between the launch point and the impact

asked by candace on February 14, 2010
4. ### physics

A projectile is fired with an initial speed of 65.2 m/s at an angle of 34.5 degree above the horizontal on a long flat firing range. Determine (a) The maximum height reached by the projectile, (b) The total time in the air, (c)

asked by Anonymous on August 4, 2014
5. ### Physics

I'm having trouble where to start with this question.. Any help would be helpful. A projectile is fired with an initial speed of 75.2 m/s at an angle of 34.5° above the horizontal on a long flat firing range. Determine (a) the

asked by LINA on January 18, 2016
6. ### Science

Prove that the maximum horizontal range is four times the maximum height attend by a projectile when fire at an inclination so as to have maximum horizontal range

asked by Morzina wahab on September 5, 2017
7. ### pre-calc

analyzing the motion of a projectile: a projectile is fired from a cliff 200 feet above the water at an inclination of 45 degrees, with a muzzle velocity of 50 feet per second. the height of the projectile above the water is given

asked by steph on November 10, 2011
8. ### physics

a projectile is thrown from the ground with an initial velocity of 20.0 m/s at an angle of 40.0 degrees above the horizontal. find the projectile's maximum height, the time required to reach its maximum height, its velocity at the

asked by Anonymous on February 10, 2014
9. ### physics

three more questions: 1) A 1.50kg projectile is launched at 18.0m/s from level ground. The launch angle is 26 degrees above the horizontal. (Assume negligible friction) a) What is the maximum height reached by this projectile? b)

asked by stacy on February 17, 2011
10. ### Physics

A projectile motion thrown with velocity of 200m/s direction of 53 degree above the horizontal?determine height,range,total time,time at particle reach maximum height?

asked by Anonymous on September 30, 2012

More Similar Questions